(01.03 mc)

object a has a mass of 10 g and a volume of 8 cm3. object b has a mass of 10 g and a volume of 6 cm3. which object has a greater density and by how much?

a. object a, by 2 grams per cubic centimeter

b. object a, by 0.42 gram per cubic centimeter

c. object b, by 2 grams per cubic centimeter

d. object b, by 0.42 gram per cubic centimeter

Find the protons, electrons and neutrons for strontium with a mass of 83

Ais a mountain created from eruptions of lava, ash, rocks, and hot gases.

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)